Additional Financial Information (Schedule Of Payables And Other Current Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable	$ 54.6	$ 41.3
Accrued taxes	24.5	41.9
Accrued payroll-related expenses	118.9	131.6
Derivative Liabilities	22.8	17.6
Accrued expenses, other	69.6	63.5
Restructuring and exit costs	16.4	8.7
Deferred Revenue, Current	10.4	17.5
Accounts Payable and Accrued Liabilities, Current	$ 317.2	$ 322.1